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74 lines
1.6 KiB
Markdown
74 lines
1.6 KiB
Markdown
## Run subprocess
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[API Reference](https://doc.deno.land/https/github.com/denoland/deno/releases/latest/download/lib.deno.d.ts#Deno.run)
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Example:
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```ts
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// create subprocess
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const p = Deno.run({
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cmd: ["echo", "hello"],
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});
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// await its completion
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await p.status();
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```
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Run it:
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```shell
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$ deno run --allow-run ./subprocess_simple.ts
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hello
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```
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Here a function is assigned to `window.onload`. This function is called after
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the main script is loaded. This is the same as
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[onload](https://developer.mozilla.org/en-US/docs/Web/API/GlobalEventHandlers/onload)
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of the browsers, and it can be used as the main entrypoint.
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By default when you use `Deno.run()` subprocess inherits `stdin`, `stdout` and
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`stderr` of parent process. If you want to communicate with started subprocess
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you can use `"piped"` option.
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```ts
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const fileNames = Deno.args;
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const p = Deno.run({
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cmd: [
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"deno",
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"run",
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"--allow-read",
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"https://deno.land/std/examples/cat.ts",
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...fileNames,
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],
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stdout: "piped",
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stderr: "piped",
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});
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const { code } = await p.status();
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if (code === 0) {
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const rawOutput = await p.output();
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await Deno.stdout.write(rawOutput);
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} else {
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const rawError = await p.stderrOutput();
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const errorString = new TextDecoder().decode(rawError);
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console.log(errorString);
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}
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Deno.exit(code);
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```
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When you run it:
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```shell
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$ deno run --allow-run ./subprocess.ts <somefile>
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[file content]
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$ deno run --allow-run ./subprocess.ts non_existent_file.md
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Uncaught NotFound: No such file or directory (os error 2)
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at DenoError (deno/js/errors.ts:22:5)
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at maybeError (deno/js/errors.ts:41:12)
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at handleAsyncMsgFromRust (deno/js/dispatch.ts:27:17)
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```
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